John b



' lance withfmy invention.

SPECIFICATION forming part oi Lettera Patent Norld, dated February 9, 1886. Application filed November 26, 1884. Serial No. 148,962. (No model.)

To ajZZ whom t may concerm' i Beit known that I, JOHN R. HILL, a citizen of the United States, residing at Washington city, in the District of Columbia, have invented certain Improvementsin Printingfrom Engraved Plates; and I hereby declare the following ytor-be a full, clear, and exact-descrip-v tionof the saine, reference being had to the.,

specification, inl whichm I v .v v

Figure 1 is a plan of a plate madein accord- Fig. 2 is an eni i larged section of ar portion of the saine.

My invention `relates generally to plates` which are' engraved toV print fro.m,'o.r dupli- Cates thereof, and is contined to no particular `kind or .kinds of plates, nor toanyparticular manner of making the lines on plates.

The object of my invention is to provide an engraved plate adapted for printing purposes,

vwhich will only receivethe printing-inkin and-upon thev engraved lines, and reject or replates, as is now necessitated by the pel the ink throughout the plane surface of the plate in the same manner as a lithographieprinting stone, thereby avoiding th'etronblesome cleaning oi' superfluous ink from the devices and methods in use in plate-printing.

Myiuvention consists in an engraved plate having its surface, with the exception of the printing-lines,covered with a coating of zinc,-

.Whereby the ink will, as the inning-roller is passed over the surface, adhere only'to that portion ofthe plate represented by the printing-lines;7 and not adhere to the zine-covered surface, the ink having no aiiinityfor the zinc when properly prepared, and not adhering to it.' f

In order that those skilled in the art may make and use my invention, I will proceed to describethe exact manner in which l have carried it out.

A plate for printing purposes (lettered A inthe drawings) is provided in any desirable manner with printing-lines a c. The surface of plate A'is then coated lin any well-known way with zinc lm b, leaving the printing-lines free from the zinc lm or coating, or the eni tire'plate 'may receive the zinc film or coatrial foi-or manner of filling the printing-lines.

, and extract of gall.

ing.

, 5o ThoughI prefer to deposit the zinc coating i on plate A by electrolysis, I by no means confine myself to any particular manner of making said deposit or zinc surface, but contemplate'availing myself of any method or means that may be found desirable.

When the plate is properly coated,I

p ss nu the printing-lines with asuitable composition having an'affmity for printing-ink. This composition for filling the lines may be some materiall ot' a waxy nature having lthe requisite toughness and cohesive qualities, or it may be made of a variety of materials, and I consequently confine myself to no particular mate- 6 After preparation as above described the 5 plate may be treated with a solution of gum and acid in a similar manner to the'prepara'- tion of a lithographie-printing stone, and is ready for use in any of the ways of printing known to those skilled in the art, the operation in lplate-'printing ofcleaning the superduous ink from the plate being dispensed with.

- Previous to printing, the plate may be treated with a solution of dissolved gum, nitric acid, -75

lf, during the printing, a small quantity ot' gall is added to the dampening-water, it will have a tendency to keep the plate in .a state oi' continual preparation.

Having thus described my invention, .what I claim as new, and desire to secure by Letters Patent, isv l. An'engraved plate for printing purposes, having a coating of zinc exterior of the printing-lines, for the purposes set forth.

2. An engraved plate for printing purposes, having azinc coating exterior of the printinglines, andA said printing-lines filled with a ma` terial having an afnity for printing-ink, sub- 9o stantially as described.

JOHN R. HILL.

Witnesses:

E. B. HAY, JAMES E. FITCH. 

